MozbBackup. Backup your Firefox bookmarks, extensions, history etc. Free and pretty useful if you are a Firefox power user (although I had to say that it failed to backup my 38 + extensions, and just stalled). Nevertheless definitely worth a look.
MozBackup is a simple utility for creating backups of Mozilla Firefox, Mozilla Thunderbird, SeaMonkey, Mozilla Suite and Netscape profiles. It allows you to backup and restore bookmarks, mail, contacts, history, extensions, cache etc. It’s easy way to do Firefox backup, Thunderbird backup …This program is freeware and works on Windows 98/ME/NT/2000/XP/2003. It’s developed in Czech republic.